Extension drawer slide



J. PIPE EXTENSION DRAWER SLIDE Filed Nov. 14, 1932 2 Sheets-Sheet l Nov.20, 1934.

Nov. 20, 1934. J. PIPE EXTENSION DRAWER SLIDE Filed Nov. 14, 1952 2Sheets-Sheet 2 bww-YW l doh) Ti o@ l WM a@ i SHOW @M Patented Nov. 20,1934 UNITED STATES EXTENSION DRAWER. SLIDE John Pipe, Grand Rapida,Mich., assignor to Metal Oihce Furniture Company, Grand Bapil, Mich., acorporation of Michigan Application November 14, 1932', Serial No.642,578

'z claims. (c1. 4s-'m The invention relates generally to a cantileverextension means and more specifically to an extension drawerconstruction.

One difculty which has always been present to a great or less degree inmechanisms of this character is the resistance to motion, such being theresult of friction between the several relatively movable parts and itis a primary object of this invention to so construct and inter-relatethe parts as to greatly reduce the friction therebetween.

In accomplishing the above result, I utilize full floating rollerbearings in several places and also additional advantages are attainedin the said construction as will be apparent from the followingdescription.

Another advantage lies in the shiftable extension slide, this extensionslide having three rollers mounted therein, said rollers supporting adrawer slide at three spaced apart points when the extension slide is inan extended position, the pressure downwardly upon the drawer slidecausing a shifting of the extension slide upwardly at its outer endwhereby this three point contact occurs. The central roller, when theslide members are in extended position, serves as a fulcrum for thedrawer slide resting 'thereon and the outer roller provides a fulloating contact between the drawer slide and the extension slide. Thislast mentioned roller comes into contact with the stationary track whenthe slide members are in their retracted positions and hence supportsthe drawer on the stationary track through this slide roller and thedrawer slide, the drawer being attached to the drawer slide as will beset forth in the following description.

Another advantage lies in my provision of the full floating rollerconnection between the rear end of the drawer slide and the upperportion of the extension slide, this roller being one of the threerollers previously referred to.

A further feature is the provision of a full floating roller mountedbetween the upper rear edge of the extension slide and a stationarychannel shaped portion located thereabove.

Another advantage lies in the stop means for preventing excessiveoutward movement of the extension slide, this stop means beingintegrally formed with the extension slide and serving to preventlateral movement of the extension slide when said slide is in its outerposition.

Other advantages lie in the particular economical and eflicientconstruction of the several parts.

Referring to the drawings:

Fig. 1 is a side view of my invention as applied to a drawer, partsbeing broken away in order to expedite the showing.

Fig. 2 is a view similar to Fig. 1, but showing the several members inextended position.

Fig. 3 shows the extension slide and the drawer 60 slide located thereinin fully extended position. F1Fig. 4 is a view taken along the line 4--4of Fig. 5 is a view taken along the line 5-5 of Fig. 1.

Fig. 6 is a view taken along the line 6-6 of Fig. 3, parts being brokenaway as shown.

Fig. 'l is a view looking in the direction of arrow A of Fig. 3.

Similar numerals refer to similar parts 70 throughout the several views.

Numeral 10 indicates the frame construction, such having Z-bars 11 asreinforcing, these Z- bars having the stationary track 1 weldedthereonto. The stationary track 1 consists of a ver- 75 tical portion12, a horizontal portion 13 and a short upturned flange 14. 'I'hevertical portion 12 of this track member, as aforesaid, is welded to thereinforcing members 11 and also may be attached at its front end to areinforcing member 15. The member 15, see Fig. 6, is welded to the frontof the frame or case 16 and serves as a vertical reinforcing meanstherefor. See Fig. 3.

As shown in Fig. 1, the horizontal portion 13 a5 of the stationary trackis raised as indicated at 4, the purpose of this to be set forth laterin the specification..

The vertical portion 12, see Fig. 4, extends upwardly near the rear endthereof and is bent inwardly at 16, then downwardly in a verticalportion 17, then inwardly as at 18 and terminates in a depending ange19. Also see Fig. 2. The portion 17 is slotted as indicated at 20, thisslot receiving the stub shaft 21 of the anti-friction 95 means 22.

The extension slide 2. which rides in the stationary track 1, consistsof a vertical portion 30 having a bottom portion 31 which terminates inan upturned flange 32, this flange being bent as indicated at 33, seeFig. 5, which prevents upward movement of the shaft 34 of ananti-friction roller 35, such roller being received in the slot 36 ofthe bottom portion 31.

The slot 36, see Fig. 1, extends for a considerable distance whereby theroller 35 may move therealong as will be set forth later in thespecication.

The bottom portion 31 is also cut away to receive the roller 39, seeFigs. 1 and 2, and a slot lli This bent out portion 47 also preventsexcessivey upward movement of the front end of the extension slidemember.

An L-shaped member 50, see Pig. 4, is welded to the underside of the topportion 44 of the extension slide, this member having a relatively longslot 51 formed therein. A roller member 52 having a single stub shaft 53which is received in the slot 51, rides between the upper side of theextension slide and the drawer slide 3 which is now to be described.

The drawer slide 3, such being attached to the` drawer 60, see Figs. 4and 5, consists of a vertical portion 61 which is welded to the drawer60, and a horizontal portion A62 which terminates in a depending portion63. A stop plate 64, see Figs. 3, 4 and 7, is welded to the drawer 60.

As has been described, rollers 22, 35 and 52 provide anti-friction meansbetween the several parts and they may be referred to as "full oatingmeans. Also, it is to be observed that the roller 35 provides a fullfloating means not only between the drawer slide and stationary member,when the parts are at or near their inner position, but the axle 34,extending from both sides of the roller 35, see Fig. 5, is of such sizeas to roll along the extension slide a distance substantially equal tothe slot 36, in which it rides, during the outward movement of thedrawer slide.

The operation When the slides are in retracted position the parts arelocated as shown in Fig. lv and the weight of the drawer is carriedprincipally by the rollers 35 and 39.

' However, as soon as the drawer is drawn slight- -ly outwardly, theroller 39 rolls upon the raised portion 4 of the track 13 and when thisoccurs the top partwof this roller raises the drawer slide by contactingunderneath the same and this causes the drawer slide and drawer to beraised slightly at their outer ends because the roller 52 rolls againstthe rear portion of the drawer slide at its top side and prevents suchfrom moving upwardly. Therefore, as the inner end of the drawer slide isheld in the same plane and as the adiacent portion is elevated by theaction of the roller 39, such will cause the raising of the outer end ofthe drawer and drawer slide.

This elevating is desirable as it gives a gravity impulse to the drawerwhen it is pushed towards its closed position and thus the drawer willreadily be closed. In other words, the slight lowering of the drawerduring its final stage of lclosing provides an impulse which fullycloses the same.

It is also desired to explain that the roller 39, rolling between thedrawer slide and the stationary track, travels outwardly only half asfast as the roller 52, the roller 52 rolling between the drawer slideand the extension slide. Thus, during the initial movement, referred toin the preceding paragraphs, the upper roller 52 moves outwardly at aspeed twice that of the roller 39 and as the roller 52 bears against theupper side of the drawer slide 3 and gradually approaches the roller 39it causes a gradual elevating of the outer end of the drawer. 'I'hat is,the roller 39 might be said to serve as a traveling fulcrum member. withthe roller 52 preventing movement of the inner end of the drawer slideupwardly. During this initial movement the roller 35 is lifted slightlyfrom its track 1. v

Further outward movement of the drawer causes the roller` 39 to rollcompletely over the elevation 4 and this causes the extension slide 2and the drawer slide 3 to return to substantially horizontal positionwhereupon the rollers 35 and 39 support the drawer slide and if only theouter end of the drawer is loaded then the roller 35 becomes the fulcrumpoint of the drawer slide 3 with the roller 52 serving as means toprevent upward movement of the drawer slide. The roller 35 rolls upon'its axle 34 during this movement.

During the start of the initial outward movement the weight ofA thedrawer, transmitted through the drawer slide is directly carried uponthe stationary track 1 by means of the rollers 35 and 39. Furtherinitial movement causes the elevating of the several parts, aspreviously described, and during this movement the extension slide 2pivots upon the roller 39, similar to the drawer slide 3. However, theextension slide 2 is held at its rear portion against upward movement bythe small roller 22. This roller 22, combined with the roller 39, actsupon the extension slide 2 to cause it to have an upward tiltingmovement at its outer end similar to that set forth in connection withthe drawer slide 3.

It will be apparent that the rollers 39 and 52 will cause movement ofthe drawer slide outwardly at twice the speed as that of the extensionslide. The upper rear flange of the extension slide, see Figs. 2 and 4,rides against the roller member 22, this roller member bearing againstthe underside of the horizontal portion 16.

'I'he stop member 64, see Fig. 7, abuts against the stop member 45 toprevent excessive outward movement of the drawer slide relative to -theextension slide while the stop member 46 comes against the out struckportion 47 of the member 15 to prevent excessive outward movement of theextension slide.

Having thus revealed this invention, I claim as new and desire to securethe following combinations and elements, or equivalents thereof, byLetters Patent of the United States.

I claim:

1. In a device of the class described, a stationary track, an extensionslide adapted to be received upon the said stationary track, saidextension slide having a roller positioned intermediate its ends, saidroller running along the stationary track whereby the extension slidemay be reciprocated therealong, said roller contacting against androlling upon the track and carrying a fractional part of the weight ofthe slide and its appurtenances at all times, means located at the rearof the extension slide and slightly above the same whereby the extensionslide may tilt slightly about the roller mounted thereon, said rollerserving as the fulcrum about which the extension slide tilts, a drawerslide mounted upon the roller of the extension slide, said drawervslidealso being capable of tilting about the said roller, the upper surfaceof the said roller serving as a fulcrum about which the drawer slidetilts, roller means positioned at the front of the extension slide belowthe drawer slide whereby the drawer slide is limited in its tiltingmovement and additional means between the opposite end of the drawerslide and the extension slide for likewise limiting the said tiltingmovement of the drawer slide.

2. In an extension drawer slide the combination of, a stationary track,an extension slide, means for mounting the extension slide for movementoutwardly along the said stationary track. and means for preventingupward movement of the rear end of the extension slide, said meansincluding a channel shaped portion of sheet metal located in invertedposition over the upper surface of the said extension slide and fixed tosaid stationary track, one of said anges of the U- shaped portion havinga long slot therein, and a roller member having a stub shaft extendingfrom one side thereof positioned between the upper surface of theextension slide and the web of the said U-shaped member, said stub shaftof the roller extending through the. slot for the purpose described.

3. A combination of elements as set forth in claim 2 but also having anintegral portion extending from one of the flanges of said U-shapedmember outwardly and then downwardly around the extension slide toprevent lateral movement thereof.

4. In combination, a stationary track member, an extension slide ofchannel shape, means to mount the extension slide upon the stationarytrack member for reciprocating movement, the web of the extension slidebeing vertically positioned and at right angles to the upper surface ofthe stationary track member, stop means integrally formed from the upperange of the extension slide, said stop means being in alinement with theweb of the said extension slide and additional means contacting withsaid stop means when the extension slide is in retracted positionwhereby the extension slide is held against lateral movement.

5. In combination, a stationary track member,

an extension slide of channel shape, means tomount the extension slideupon the stationary track member for reciprocating movement, saidmounting means including a roller having a stub shaft extending axiallyfrom one side thereof, the flange of the extension slide being cut awayto permit placing the roller therein, saidI cut away portion beingcontinued in a plane at right angles thereto to receive the stub shaftwhereby the roller is revolubly mounted, a drawer slide, and means formounting the drawer slide within the extension slide, said drawer slideresting upon the said roller for the purpose described.

6. In a device of the class described, a stationary track, an extensionslide adapted to be received upon the said stationary track, saidextension slide having a roller positioned intermediate its ends, saidroller running along the stationary track whereby the extension slidemay be reciprocated therealong, means located at the rear of theextension slide and slightly above the same whereby the extension slidemay tilt slightly about the roller mounted thereon, said roller servingas the fulcrum about which the extension slide tilts, a drawer slidemounted upon the roller of the extension slide, said drawer slide alsobeing capable of tilting about the said roller, the upper surface of thesaid roller serving as a fulcrum about which the drawer slide tilts,roller means positioned at the front of the extension slide below thedrawer slide whereby the drawer slide is limited in its tilting movementand additional means between the opposite end of the drawer slide andthe extension slide for likewise limiting the said tilting movement ofthe drawer slide. A

7. In a device of the class described, a stationary track, an extensionslide adapted to be received upon the said stationary track, saidextension slide having a roller positioned intermediate its ends, saidroller running along the stationary track whereby the extension slidemay be reciprocated therealong, means located at the rear of theextension slide and slightly above the same whereby the extension slidemay tilt slightly about the roller mounted thereon, said roller servingas the fulcrum about which the extension slide tilts, a drawer slidemounted upon the roller of the extension slide, said drawer slide alsobeing capable of tilting about the said roller at all times, the uppersurface of the said roller serving as a fulcrum about which the drawerslide tilts, roller means positioned at the front of the extension slidebelow the drawer slide 'whereby the drawer slide is limited in itstilting movement and additional means between the opposite end of thedrawer slide and the extension slide for likewise limiting the saidtilting movement of the drawer slide.

JOHN PIPE.

